Definition: You are given a math word problem and you are supposed to make use of mathematical concepts like probability, combinatorics, linear equations, sequences/series, or simple operators like addition, subtraction, division, or multiplication to answer the given question. Choose the best option from the 5 given options and report that option.
Input: Question: The speed of a boat in still water is 60kmph and the speed of the current is 20kmph. Find the speed downstream and upstream?

 Option A: 17 kmph

 Option B: 40 kmph

 Option C: 16 kmph

 Option D: 18 kmph

 Option E: 20 kmph

Option B